Mine is stone stock, right down to the pipe, and my most recent ride was in deep sand. I expected bad mileage, but it got barely 15 mpg, which doesn't seem right. I'm mystified that it seems to get substantially worse mileage than my carbed bike, especially when the 450 I demoed was so far on the other end of the spectrum.

About 35 mpg running pretty hard on a mix of atv trails and single track has been my experience so far on a '13 XC-W. Santa is bringing a new 3.2 gal Acerbis so I can hopefully get close to 100 miles on a tank. This is similar to the mileage I got on my '03 450 RFS.